My Hobie 21se, is kinda small , ( not considered a cruising cat )
but it will hold 20Kt all day if the wind is up !

I purchased plans for this cat, it's called Sango , by Woods design.
It is 7.7M long and suppose to go 20+ knots ; i chose this one
because it will carry nearly 500Kg payload, and if i get rid of the
ranch-house between the pontoons, that payload would go up
a Bunch !! Plan to put a removable tent for camping instead ; otherwise
it will be a , (trailer-able) open-deck boat.